Heuchera plant named &#39;tnmt&#39;

ABSTRACT

A new and distinct hybrid of  Heuchera  plant characterized by medium sized, lobed, slightly ruffled leaves with a distinctive white veil, red gold to amber to khaki leaf color, and a small, mounding habit.

BOTANICAL DENOMINATION

Heuchera spp.

VARIETY DESIGNATION

‘TNMT’

CROSS REFERENCE TO HEUCHERA ‘AMBER WAVES’ (U.S. PLANT PAT. NO. 13,348) Background of the Invention

The present invention relates to a new and distinct cultivar of Heuchera and given the name of ‘TNMT’. Heuchera is in the family Saxifragaceae. Heuchera ‘TNMT’ originated from a mutation in tissue culture of Heuchera ‘Amber Waves’ (U.S. Plant Pat. No. 13,348). It was found in the production area of the nursery.

Compared to the parent, Heuchera ‘Amber Waves’, the new cultivar has leaves that are wavier and have a white veil rather than no veil.

This new Heuchera is uniquely distinguished by:

1. medium sized, lobed, slightly ruffled leaves with a distinctive white veil,

2. red gold to amber to khaki leaf color, and

3. small, mounding habit.

This new cultivar has been reproduced only by asexual propagation (tip cuttings and tissue culture). Each of the progeny exhibits identical characteristics to the original plant. Asexual propagation by division and tissue culture using standard micropropagation techniques with terminal and lateral shoots, as done in Canby, Oreg., shows that the foregoing characteristics and distinctions come true to form and are established and transmitted through succeeding propagations. The present invention has not been evaluated under all possible environmental conditions. The phenotype may change with variations in environment without a change in the genotype of the plant.

BRIEF DESCRIPTION OF THE DRAWING

The photo shows a one-year-old plant of Heuchera ‘TNMT’ growing in the ground in shade in the garden in May in Canby, Oreg.

DETAILED PLANT DESCRIPTION

The following is a detailed description of the new Heuchera cultivar based on observations taken in May of eleven-month-old specimens growing in 4 inch pots in the greenhouse in Canby, Oreg. Canby is Zone 8 on the USDA Hardiness map. Temperatures range from a high of 95 degrees F. in August to and average of 32 degrees F. in January. Normal rainfall in Canby is 42.8 inches per year. The color descriptions are all based on The Royal Horticultural Society Colour Chart, 5^(th) edition.

-   Plant:     -   -   Form.—basal rosette, herbaceous perennial.         -   Hardiness.—USDA Zone 4 to 9.         -   Size.—19 cm tall from top of the foliage to the ground and             37 cm wide.         -   Habit.—mounding from one main crown.         -   Vigor.—excellent. -   Leaf:     -   -   Type.—simple.         -   Arrangement.—rosette.         -   Shape.—broadly ovate.         -   Lobing/division.—5 main lobes, the terminal is the longest;             shallow secondary lobes, bottom two lobes often deeply cut.         -   Venation.—palmate.         -   Margins.—broadly crenate and undulate.         -   Apex.—mucronulate.         -   Base.—cordate, lobes strongly overlapping at the base.         -   Blade size.—grows to 12 cm long and 12.5 cm wide.         -   Texture.—leathery.         -   Surface texture.—glandular on both sides.         -   Petiole description.—grows to 14 cm long and 2 mm wide,             glandular hairs, closest to Greyed Red 182B.         -   Leaf color.—variable; topside, new spring leaves open with             veiled Greyed Brown 199D with prominent reticulate veins             Greyed Orange 166B, bottom side Greyed Purple 185A; mature             leaves and summer leaves are veiled Greyed Yellow 162D with             veils Yellow Green 152A, bottom side Greyed Purple 185D;             older and winter leaves are Yellow Green 146B with some             veiling Yellow Green 148D, bottom side Yellow Green 146B             tinted Greyed Purple 185A. -   Inflorescence:     -   -   Size.—grows to 6 cm wide and 31 cm long.         -   Type.—thyrse.         -   Number of flowers per thyrse.—about 90.         -   Number of thyrse.—2.         -   Peduncle.—about 52 cm long, 3 mm wide at base, Greyed Purple             185A, glandular hairs, with 3 to 4 cauline leaves, blades             ovate, 5 lobed, grow to 4 cm long and 3.5 cm wide, crenate,             mucronulate, cordate to attenuate, Greyed Orange 165B on             top, 184B on bottom, petiolate lower leaves.         -   Pedicel.—variable in size, with glandular hairs, Greyed             Purple 185A.         -   Bloom period.—May through June in Canby, Oreg. -   Flower bud:     -   -   Size.—2 mm wide and 3 mm long.         -   Description.—glandular puberulent, ovoid, down facing.         -   Color.—Greyed Purple 186B on bottom half 186D on top half. -   Flower:     -   -   Type.—perfect.         -   Shape.—campanulate.         -   Size.—4.5 mm long and 3 mm wide.         -   Corolla description.—5 in number, 1.5 mm long and 0.5 mm             wide, spatulate, curled back, tip acute, margin entire,             glabrous on top side, glandular on bottom side, White 155A.         -   Calyx description.—campanulate, 3 mm long and 3 mm wide,             with 5 lobes divided ⅓ way to the base, glandular hairs,             tips obtuse, margin entire; Red Purple 62D with lobe tips             Red Purple 61 A.         -   Stamen description.—5 in number, filaments 2.7 mm long,             White 155A, anthers 0.5 mm, Orange 26A, pollen Yellow Orange             20B.         -   Pistil description.—1, 2-beaked, 4 mm long; ovary 1.5 mm             long, style 2.5 mm long, White 155A overall.         -   Fragrance.—none.         -   Lastingness.—each thyrse blooms for about 3 weeks on the             plant -   Fruit:     -   -   Type.—two-beaked ovoid capsule.         -   Fertility.—good.         -   Color.—Brown 200D. -   Seed:     -   -   Shape.—linear.         -   Size.—2 mm. long.         -   Color.—Black 202A. -   Pest and disease tolerance: Excellent disease resistance to powdery     mildew, the common problem of Heuchera. Susceptible to Heuchera rust     and root weevils. 

1. A new and distinct Heuchera plant as herein illustrated and described. 